28189000 has 64 divisors (see below), whose sum is σ = 75404160. Its totient is φ = 9662400.

The previous prime is 28188997. The next prime is 28189003. The reversal of 28189000 is 98182.

It is an interprime number because it is at equal distance from previous prime (28188997) and next prime (28189003).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 28189000.

It is not an unprimeable number, because it can be changed into a prime (28189003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4987 + ... + 9013.

It is an arithmetic number, because the mean of its divisors is an integer number (1178190).

Almost surely, 2^28189000 is an apocalyptic number.

28189000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28189000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37702080).

28189000 is an abundant number, since it is smaller than the sum of its proper divisors (47215160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28189000 is a wasteful number, since it uses less digits than its factorization.

28189000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4055 (or 4041 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 28189000 is about 5309.3314080023. The cubic root of 28189000 is about 304.3405981720.

The spelling of 28189000 in words is "twenty-eight million, one hundred eighty-nine thousand".